Ellipsograph.



D. C. REID.

ELLIPSOGRAPH.

APPLICATION mFuJuLY 1. 1915..

Patented June 6, 1916.

THE coLUmslA PLANOGRKPH co., wAsnlNa'mN. D. c.

To all whom t may concern:

NTTED sTATEs PATENT oEEioE.

DANIEL C. REID, OF PHILADELPHIA, PENNSYLVANIA.

ELLIPSOGRAPI'I.

Be it known that I, DANIEL C. REID, a subject of the King'of England, residing at Philadelphia, in the county of Philadelphia and State of Pennsylvania, have invented new and useful yImprovements in Ellipsographs, of which the following is a specification.

The invention relates to drafting instruments, and more particularly to ellipsegraphs, and has for an object to provide a device for Vquickly and accurately describing ellipses of various degrees of curvature and proportion.

The invention comprehends, among other features, an-instrument which is small and compact and which therefore can be easily and conveniently carried in the pocket. Although preferably adapted for use with a beam compass the ellipsograph` may be used in connection with other similarforms of drafting instruments in order to effect the` desired result.

In the further disclosure of the invention reference is to be had to the accompanying drawings, constituting a part of Vthis specification, in which similar characters of reference denote corresponding parts in all the views, and in which Figure 1 is a perspective view of the ellipsograph, showing the same in use, Fig. 2 is a vertical longitudinal sectional view taken through the ellipsograph, showing the same in use with a form of drafting instrument, Fig. 3 is a horizontal sectional view taken on the line 3-3 in Fig. 2, Fig. 4 is a plan view of the ellipsograph showing in dotted lines, an extension on one of the pieces, Fig. 5 is a longitudinal sectional view taken on the line 5 5 in Fig. 4, Fig. 6 is a plan view of the extension, and Fig. 7 is a vertical transverse sectional view taken through one of the pieces.

Referring morel particularly to thenviews, I disclose a sheet of drawing paper 10, upon which a ellipsograph, indicated by the numeral 11, is suitably arranged. The ellipsograph in detail comprises two pieces 12 and 13 relatively arranged in a cruciform shape, the piece 13 being formed with a cross channel 14 into which the piece 12 is fitted, with the piece 12 likewise formed with a cross channel 15 receiving the piece 13. Thus the pieces 12 and 13 will be disposed at right angles to each other, and, referring carefully to Figs. 1, 2 and 4 it will be seen Specification of Letters Patent.

that eachV piece has a longitudinal groove, with that of the piece 12 indicated by the numeral 16 and the groove of the piece 13 indicated by the numeral 17, said grooves intersecting at the juncture of the two pieces. The grooves 16, 17 are V-sha-ped and it will be clearly seen that in order to make the groove 17, in the piece 13, appear continuous, the piece 12 has a groove 18 extending transversely thereof to form a part of and be continuous with the groove 17 when the two 4pieces arejoined together. Instead of connecting the two pieces at substantially their centers, the piecev 12 may be attached or joined to the piece 13 near one end of the latter, a channel 19 being provided in the piece 13 for this purpose. Thus by rela-- tively joining the pieces as set forth different forms of ellipses can be made, as will be Patented June 6, 1916.

Application led July 7, 1915. Serial No. 38,575. i

hereinafter more fully described. The uppermosty piece 12 as clearly shown in Fig. 1 has notches 20 formed therein for the reception of portions of the heads 21, of suitable thumb tacks 22, which serve to hold the ellipsograph rigidly upon the drawing paper.

form of drafting instrument for use with the ellipsograph is clearly shown and consists of a bar 23 carrying at one end a pencil or stylus 24, said bar being formed with a longitudinal slot 25, suitable legs 26, pivoted at their upper ends, being disposed to have their lower portions pass through ellipse can be readily and accurately described with the form of instrument and ellipsograph set forth.

Referring to Figs. 4 and 6 it will be seen that a suitable extension, consisting of an auxiliary piece 28, having a groove 29 and dove-tail end 30, can be easily applied to an end of one of the pieces for the purpose of lengthening the same, the groove 29 of said auxiliary piece being disposed to Vregister with the groove ofthe main piece as in Fig. 6 and in which instance, the groove 29 registers with the groove 16 in the piece 12. 'By pointing the ends of the pieces as at 31, the instrument can be readily arranged in proper position by having the pointed ends aline with the usual centering lines 32.

From the foregoing description it willv be clear that the artiele described can be cheaply manufactured and that the tivo bars 0r pieces can be readily disassembled to per mit of easily carrying the device in the pocket. The ellipsograph can be made of any desired material and in various sizes to suit the particular application of the article. To this end it will be clear that various slight changes in form. may be made Without departing from the spirit of lthe invention.

Having thus described the invention, I claim:

l. rIhe combination with dividers, of a longitudinally slotted bar disposed across the legs of the dividers, means adjustably embracing said legs of the dividers and also adjustably engaged in the slot in the bar, means on one end of the bar for the fastening of a pencil or stylus thereto, and a cross shaped base frame having longitudinally disposed intersecting channels for receiving the terminals of the legs of the dividers to guide the saine when the dividers are manipulated.

2. The combination With a drafting in strument, of a frame including a pair of crossed arms connected with each other, with their upper surfaces in the same plane with one another, each arm being formed with a said arms being formed near opposite endsV with notches in its longer edges and also having seats in its upper face, and tack-'like fasteners engaged in the notches and having their heads received in the seats to fasten s the arms against movement.

3. In an ellipsograph, a pair of arms, one of said arms being formed with a plurality of notches While the other is formed with a single notch in one side thereof, whereby the arms can be adjustablyV interlocked Witheach other in crossed relation to one another, the said arms being formed with grooves in their upper faces for forming la runway for a drafting instrument.

In testimony whereof I affix my signature.

DANIEL C. REID.

Copies ofthie patent may Vbe obtained for ve cents each, by addressing the "Commissioner of Patenti, Washington, 110. 

